What this means
The IEEE assigned the MA-L block 781C3C to Espressif Inc.. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 78:1C:3C, it is Espressif Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 781C3C?
781C3C is registered to Espressif Inc. in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Espressif Inc.'s block covers 16,777,216 addresses.
What devices use 781C3C?
Any network device with a MAC address starting 78:1C:3C was manufactured by or for Espressif Inc..